Automatic blast torch



Dec, 14, 1937., g c BRODY 2,102,404

AUTOMATIC BLAST TORCH Filed Aug. 10, 1936 Jllllllllllllll ii HIIIIHIHH IIHHIHH INVENTOR. 23 24 Samue azmcg BY I @W.

ATTORNEY.

Patented Dec. 14, 1937 UNITED STATES PATENT OFFICE AUTOMATIC BLAST TORCH Samuel C. Brody, Brighton, Mass.

Application August 10, 1936, Serial No. 95,220

8 Claims. (01. 158-35) This invention relates to automatic blast functional features never heretofore attained in torches. While particularly adapted for use the art. With a torch of the self-generating type which In all prior art torches with which I am familemploys a combustion burner mounted in cone es n f e j t u as been Such 5 junction with the pressure generating unit, it s to fie I10 pp y for expansion 5 may be used with a torch which does not emvolatilization of the gases produced by the genploy such combustion burner but instead depends ereting u prior to their l y nto the comupon the flame from the priming unit being cont on burner. tinuously played on the outer end of the pres- AS a Consequence, Such gases Were discharged sure generating t t Cause t torch t from the jet orifice of the jet unit forthwith into 1 tinue to generate a blast fia the combustion burner for immediate mixture Th main object of my i ti is t increase with the air entering such burner. This tended the general operating efliciency of the torch. to retard, ay or impair maximum p Other objects are to simplify and make practicaltically perfect combustion and hence greatly 1y foolproof the construction of the torch and reduced e Operating effieieney 0f he torch 15 to reduce the manufacturing cost thereof. in general. especially e b st flame.

In order that the many advantages of my y novel jet unit not only overcomes these invention may be more readily understood and disadvantages but introduces certain 116W and appreciated, reference is made to the accompanyimportant advantages Which greatly c as t e ing specification and drawing wherein I de- Operating efficiency f h torch. 20

scribe and illustrate an embodiment of my in- Among these are the w r e vention which I have found efiicient, ec0nomica1, more uniform. much Stronger, and o e conand unusually satisfactory in service and well Sttmt blast flame at the discharge end of t e adapted to the requirements of commercial manr, d h n e a much faster and much ufacture. greater generation and conduction of heat back 25 Fig, 1 is a enlarged d ti partly in to the wick and wick tube of the pressure gention, of an automatic blast torch of the self- Grating unit, thereby resulting in the Vaporizegenerating t e employing a b ti b tion of a much greater volume of gas in a shorter and equipped with novel jet unit in accord er time and a far greater volatilization of such an e ith my invention vaporized gases than ever heretofore obtained. 30 Fig. 2 shows my novel jet unit applied to an Torches q pp W my i v t n are charautomatic blast torch of the type which does acterized by their ability to Continuously enot employ such Combustion burner, and liver a blast flame of maximum heat and pres- Figs, 3 d 4, are enlarged d t views of my sure at all times, which flame is uniform and conn v l jet it. stant and does not intermittently diminish or 35 In Fig. 1, I have illustrated a e1f generating increase in intensity or volume, due to changes blast torch equipped with combustion burner. in temperature of the hurhel" 2Lhd/Ol" torch Such torch includes a generating unit I!) and a Changes in Operating Position: and/01" other combustion burner H assembled therewith. Causes which heretofore made impossible A priming or starting unit l2, such as shown pletely satisfactory continuous operation of the 40 in Fig. 2, may or may not be used with the torchtorch of Fig 1' If a Starting priming unit My novel jet unit consists of a member formed '2 is used it may, if desired, be connected to at .one end for quick detachable connection with the pressure generating unit H] in any suitable the Outer et'ld of the Wlck tub-e d at i other manner as by means of the clamping member end for quick detachable connection with the 301, its equivalent shown in Fig 2 inner end of the combustion burner. Prefer- The pressure generating unit comprises a fuel zig ifig ggi gg 22 21 g i g i i g z i g g t 3 Wlck t m Saldjacent to its end portions. The threaded por- 0 e h ex mg s a1d reservolr, and tions it and I9 engage with corresponding in- J i H mounted Wlthm the Outer end of ternal threads 26 and 2! formed, respectively, on the Wlck tuhethe wick tube and combustion burner.

My present invention is particularly directed Intermediate of the threaded portions l8 and to such Jet unit which in accordance with my [9, the jet unit is formed to provide a sealing Concept embodies Certain new ns ructional and collar or shoulder 22. One face of this collar is 55 or other leakage.

adapted to abut the outer end of the wick tube and tightly seal these parts against gas-pressure The other face of said collar is adapted to be abutted by the inner end of the combustion. burner to tightly seal these parts against gas-pressure or other leakage.

The threads l8 are relatively fine and the threads I9 are relatively coarse. The fine thread enables the jet unit to be tightly screwed and sealed into the wick tube, and the coarse thread enables the combustion burner to be screwed on and off the jet unit easily by hand. Thus the burner may beeasily unscrewed from the jet jet unit from the' unit without unscrewing the wick tube. V

The screw threaded end portions I8. and ll! of the jet unit are hollow and separated by the wall of the collar 22 which extends therebetween; This wall provides with said hollow screwthreaded portions separate chambers 23 and 24 respectively which communicate with each other through thesmalljet orifice 25 in said wall. The chamber 23 is a gas forming and'heating chamber and also acts as a gas reservoir. The chamber 24 is a gas heating, volatilizing and expansion chamber. 7

In operation, after the torch has been primed, lighted, and has startedto self-generate gas the accentuated heat from the burner is rapidly carried back through the jet unit to the wick and wick tube until a maximum heat has developed in the wick tube jet unit and burner, thereby causing the maximum fuel vaporization and gas formation in the wick tube, and at the same time heating the gas chamber 23 to a point where the stored and discharging gases therein are highly volatilized. These gases discharge through orifice 25 into chamber 24 where they have an opportunity to expand and pre-mix with the pre-heated air entering said chamber through the burner tube, thus further increasing the V01. atilization of the said mixture, so that when said .mixture enters the burner tube it is in highly combustible condition and when ignited will take on (only such necessary additional air through a l the burner tube as will give it the maximum and ideal combustion qualities.

This maximum and ideal combustion insures a continuous, uniform and steady blast flame, as well as continuous and uniform delivery of heat back to the pressure generating and gasforming units.

Charring of the wick and resultant clogging of the jet orifice is practically eliminated in my construction,due to the fact that the end por- 7 tion l8 of the jet unit is spaced away from the wick in the wick tube as well as the burner which is spaced away from the wick tube itself.

As previously suggested. my novel jet unit is equally advantageous when used with a torch which does not employ a combustion burner, as shown inFig. 2, and has practically the same advantages and merits as it has when used in conjunction with a combustion burner, except that it does not emit as hot or voluminous blast flame as when used with a combustion burner.

In the torch of Fig. 2, the flame from the priming unit is continuously played on the outer end of the pressure generating unit within which my novel jet unit is mounted.

' 'If desired, the jet unit may be so constructed as to eliminate the threaded portion I8, and when so modified is assembled with the wick tube in V 75 any practical manners Various other modifications in construction and arrangement may obviously be resorted to within the spirit and scope of my invention, as defined by the appended claims.

What 1 therefore claim and desire to secure by Letters Patent is:-

1. A jet unit adapted to be interposed between the pressure generating unit and the combustion burner of a self-generating blast torch, comprising a member having a portion projecting into from and thereby enter the combustion burner in expanded and highly volatilized form.

2. The jet unit of claim 1, said unit also having a perimetrically' extending portion in rear of said chamber-forming projection for abutment against the inner end of the burner to sealthe parts against Jeakage.

3. A jet unit adapted to be interposed between the pressure generating unit and the combus tion burner of a self-generating blast torch, comprising a member having a portion sub-dividing the same into separate but communicating chambers disposed within and open to the interiorof the pressure generating unit and combustion burner, respectively, the chamber which is ,dis posed within the combustion burner being a heated expansion chamber within which the gases emitted from said pressure generating unit enter and expand into contact with the heated inner wall surface of said chamber to absorb heat therefrom and thereby enter the combustion burner in expanded and highly volatilized form. r

4. The jet unit of claim 3, the portionwhicn subdivides the same extending perimetrically of the unit and presenting faces adapted respectively for abutment bythe inner end of the burner and the outer end of the pressure generating unit to seal said parts against leakage.

5. The jet unit of c1aim.3, the portion which sub-divides the same having a jet orifice inte-' riorly thereof by means of which the chambers communicate with each other.

6. A jet unit adapted to be interposed between the pressure generating unit and the combustion burner of a self-generating blast torch, .compris-' ing a member having hollow axially extending chamber-forming portions projecting respectively into the interior of the pressure generating unit and burner and havingan intermediate portion .separatingxsaid chamber-forming'portions, the

chamber which is disposed within the combustion burner being a heated expansion chamber withpressure generating unit and into the adjacent end of the combustion burner and providing an outwardly open chamber, said jet unit having a i in which the gases emitted from said pressure 1 ,70 prising a member having a chamber-forming portion projecting beyond the outer endof the wall portion forming the inner end of said chamber and provided with a jet orifice in communication with the pressure generating unit, and said Wall portion extending perimetrically of said jet unit and providing a sealing face for abutment by the outer end of said pressure generating unit to seal the parts against leakage, the chamber which is disposed within the combustion burner being a heated expansion chamber within which the gases emitted from said pressure generating unit enter and expand into contact with the heated inner wall surface of said chamber to absorb heat therefrom and thereby enter the combustion burner in expanded and highly volatilized form.

8. In a blast torch, a pressure generating unit, a combustion burner, and a single jet unit detachably connecting said parts, and having two separate chambers, one chamber extending into the pressure generating unit, and the other chamber extending into the combustion burner, there being an orifice connecting said chambers, and the last named chamber being a heated expansion chamber Within which the gases emitted from said pressure generating unit enter and expand into contact with the heated inner wall surface of said chamber to absorb the heat therefrom and thereby enter the combustion burner in expanded and highly volatilized form.

SAMUEL C.'BRODY. 

